import sum from './sum.js'

console.log('app',sum(100,23))


let func=()=>{
    const NUM = 45
    let arr = [1,2,5,6,7,2]
    let arrCopy = arr.map(item => item * 2)
    arr.includes(2)
    //set 去重用的
    console.log('arrCopy',new Set(arrCopy))
}
func()
new Promise(()=>{

})